I joined Office 365 shortly after its initial release. My domain name was originally domain.onmicrosft.com but soon afterward, Microsoft offered an opportunity to convert to domain.com
I've done that in every crevice I can find. However, Microsoft maintains my account in its records as domain.onmicrosoft.com
Whenever I create a new site mailbox, the mailbox address is .onmicrosoft.com
And today I received an administrative email notification from Microsoft. It listed my domain name as domain.onmicrosoft.com
How can I get Microsoft to make the change in its records?